Strange Noises

When I go into mine craft on my iMac, every time I click on something I hear an odd voice saying "click" and there are also noises in the game when I hover my mouse over wood, water, etc. It makes it impossible to play with the sound on. It only started today. I tried deleting the game and reinstalling it but the same thing happens. I also tried going in to the sound and video options but I can't stop it happening.